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3x(x^2-3)-2x(x-3)=0
(3x-2x)(x^2-3)=0
3x-2x=0 lub x^2-3=0
x=0 lub x^2=3
x=pierwiastek z 3 lub x= - pierwiastek z 3
x+3/x-2=3
zał: x nie moze byc = 2
x+3=3x-6
-2x=-9
x=4,5